// interfaces/PermittedSubclasses.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// {NewFeature} Since JDK 17

sealed class Color permits Red, Green, Blue {}

final class Red extends Color {}

final class Green extends Color {}

final class Blue extends Color {}

public class PermittedSubclasses {

public static void main(String[] args) {

for(var p: Color.class.getPermittedSubclasses())

System.out.println(p.getSimpleName());

}

}

/* Output:

Red

Green

Blue

*/